unable to create an instance

We are following RHEL openstack guide for liberty release. We are not able to start an instance and getting couple of errors in nova and compute log files.
One of those errors is "ortBindingFailed: Binding failed for port 41151c02-9e02-49f7-8101-226c2bb3c1a6, please check neutron logs for more information.ortBindingFailed" in nova-compute log.